[3] He was promoted to chief superintendent in 1997 and became commander of the Brompton Division (Kensington and Chelsea).
[2][3] Promoted to commander in November 1999,[3] Brown headed the Serious and Organised Crime Group, including the Flying Squad,[4][5] Operation Trident and SO19.
[6] From 2004, Brown headed Operation Paget, the Metropolitan Police investigation into the death of Diana, Princess of Wales, in 1997.
He was duty assistant commissioner supervising policing across London on the day that Jean Charles de Menezes was shot.
[1] Brown chaired the National Firearms Forensic Intelligence Database Working Group and was the Association of Chief Police Officers lead on hostage negotiation, being acknowledged as the national expert on the investigation of kidnap cases.